Notre Dame de Paris, also known as Notre Dame Cathedral or simply Notre Dame, is a Gothic, Roman Catholic cathedral on the eastern half of the Île de la Cité in the fourth arrondissement of Paris, France. It is the cathedral of the Catholic Archdiocese of Paris: that is, it is the church that contains the cathedra (official chair) of the Archbishop of Paris, currently André Vingt-Trois. The cathedral treasury houses a reliquary with the purported Crown of Thorns.